[BUG] offline tests fail

[ttlns]

Botright should not depend on being online for tests wich do not require an internet connection

Example exception:

tests\test_playwright.py:95 (test_canvas_botright)
@pytest.mark.asyncio
    async def test_canvas_botright():
        botright_client = await botright.Botright(use_undetected_playwright=True, user_action_layer=True)
        try:
>           browser = await botright_client.new_browser(channel="chrome")

tests\test_playwright.py:100: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
.venv\lib\site-packages\botright\botright.py:147: in new_browser
    _proxy: ProxyManager = await ProxyManager(self, proxy)
.venv\lib\site-packages\async_class.py:173: in __await__
    yield from self.create_task(
.venv\lib\site-packages\botright\modules\proxy_manager.py:68: in __ainit__
    await self.check_proxy(self._phttpx)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <botright.modules.proxy_manager.ProxyManager object at 0x00000245FA3CEE80>
httpx_client = <httpx.AsyncClient object at 0x00000245FA316B90>

    async def check_proxy(self, httpx_client: httpx.AsyncClient) -> None:
        """
        Check the validity of the proxy by making HTTP requests to determine its properties.
    
        Args:
            httpx_client (httpx.AsyncClient): The HTTPX client to use for proxy checks.
        """
        get_ip_apis = ["https://api.ipify.org/?format=json", "https://api.myip.com/", "https://get.geojs.io/v1/ip.json", "https://api.ip.sb/jsonip", "https://l2.io/ip.json"]
    
        for get_ip_api in get_ip_apis:
            try:
                ip_request = await httpx_client.get(get_ip_api, timeout=self.timeout)
                ip = ip_request.json().get("ip")
                break
            except Exception:
                pass
        else:
>           raise ProxyCheckError("Could not get IP-Address of Proxy (Proxy is Invalid/Timed Out)")
E           botright.modules.proxy_manager.ProxyCheckError: Could not get IP-Address of Proxy (Proxy is Invalid/Timed Out)

.venv\lib\site-packages\botright\modules\proxy_manager.py:123: ProxyCheckError